/*
 * Created on 14/12/2004
 * Created by Paul Duran
 * Copyright (C) 2004 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * AELITIS, SARL au capital de 30,000 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */

package org.gudy.azureus2.ui.console.commands;

import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.PosixParser;
import org.gudy.azureus2.ui.console.ConsoleInput;

/**
 * subclass of IConsoleCommand that allows the parameters to be defined using an Options object
 * 
 * @see org.apache.commons.cli.Options
 * @author pauld
 */
public abstract class OptionsConsoleCommand extends IConsoleCommand {
    private Options options = new Options();
    private CommandLineParser parser = null;

    public OptionsConsoleCommand(String main_name) {
        super(main_name);
    }

    public OptionsConsoleCommand(String main_name, String short_name) {
        super(main_name, short_name);
    }

    /**
     * take the args and try and create a command line object
     */
    public void execute(String commandName, ConsoleInput console, List arguments) {
        CommandLineParser parser = getParser();

        try {
            String[] args = new String[arguments.size()];
            int i = 0;
            for (Iterator iter = arguments.iterator(); iter.hasNext();) {
                String arg = (String) iter.next();
                args[i++] = arg;
            }
            CommandLine line = parser.parse(getOptions(), args);
            execute(commandName, console, line);
        } catch (ParseException e) {
            console.out.println(">> Invalid arguments: " + e.getMessage());
            // printHelp(commandName, console.out);
            printHelp(console.out, arguments);
        }
    }

    /*
     * (non-Javadoc)
     * @see org.gudy.azureus2.ui.console.commands.IConsoleCommand#printHelp(java.io.PrintStream, java.util.List)
     */
    public void printHelpExtra(PrintStream out, List args) {
        HelpFormatter formatter = new HelpFormatter();
        PrintWriter writer = new PrintWriter(out);
        writer.println("> -----");
        writer.println(getCommandDescriptions());
        // formatter.printHelp(writer, 80, getCommandDescriptions(), ">>>", getOptions(), 4, 4, ">>>", true);
        formatter.printOptions(writer, 80, getOptions(), 4, 4);
        writer.println("> -----");
        writer.flush();
    }

    /**
     * execute using the specified command line.
     * 
     * @param commandName
     * @param console
     * @param commandLine
     */
    public abstract void execute(String commandName, ConsoleInput console, CommandLine commandLine);

    /**
     * @return
     */
    protected CommandLineParser getParser() {
        if (parser == null)
            parser = new PosixParser();
        return parser;
    }

    protected Options getOptions() {
        return options;
    }
}
